George J. Nesbitt
  • Emeryville, CA
  • United States
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Duct Testing High Velocity Systems
2 Replies

Dose anyone have experience testing high velocity duct systems?I've been asked to duct test a Zhender HRV with comfoducts (2" homerun ducts).I designed & installed a hydronic high velocity system…Continue

Started this discussion. Last reply by Paul Morin Jan 10, 2013.

 

George J. Nesbitt's Page

Latest Activity

George J. Nesbitt replied to Rich Johnson's discussion Elec Coil heat vs Heat Pump
"Adding electric resistance coils in the ducts would likely have caused the problem discussed in the post; How Do We Make Energy Efficiency Sexy, or at Least Interesting? With your customer ending up with a higher electric bill. Adding Solar often…"
Aug 22, 2013
George J. Nesbitt replied to Bachi Brunato's discussion Need Help Decoding a Couple of Nameplates
"Are you trying to figure out the age, or the efficiency? "
Aug 22, 2013
George J. Nesbitt replied to Bachi Brunato's discussion Extraordinarily High CO Reading on a Furnace Vent: 3950 PPM
"A cracked heat exhanger would not cause high CO (unless it affected the operation of the flame). A cracked heat exhanger might allow the CO into the house, did you check ambient & a supply register for CO? High CO can mean a burner needs…"
Aug 22, 2013
George J. Nesbitt replied to Richard Scott Mills's discussion Rock Wool Old Dog New Tricks?
"Rock wool is available in rigid product, with various densities, depending on application. There is a product designed as drain board for foundations. It's available in pipe insulation, batts, and blown in. Although you may have a hard time…"
Feb 4, 2013
George J. Nesbitt replied to Jack Baikoff's discussion Measuring fresh air intake ducted to a return and no way of measuring from outside.
"That duct is an economizer. It's purpose is ventilation, and possibly cooling (rather than using the AC). Night time cooling works great in the western states in many places, where it's dry, and the temperatures drop at night to below…"
Feb 4, 2013
George J. Nesbitt replied to Mike Kandel's discussion January's Stump the Chump
"Could it be that the attic is connected to other units that did not receive air sealing & insulation. So the heat loss from those units still melt ice."
Jan 24, 2013
George J. Nesbitt replied to Jack Baikoff's discussion Measuring fresh air intake ducted to a return and no way of measuring from outside.
"Not inexpensive! Do you install it and leave it, or do you drill a hole, and have to patch?"
Jan 24, 2013
George J. Nesbitt commented on Christopher Morin's blog post Oil Tanks in Your Home
"I have a client here on the left (west) coast that had a house sale fall through recently on the right (east) coast due to the oil tank. The buyer was from the left, and not used to them. I don't know if there is any evidence of an actual…"
Jan 24, 2013
George J. Nesbitt replied to Dennis McCarthy's discussion Would you like a lighting audit with your energy audit ?
"I've always included lighting and appliances (pools & spas too) in my "audits". I've always assumed they were part of the "house". But sadly our industry tends to focus on the HVAC, air sealing & insulation. But…"
Jan 18, 2013
George J. Nesbitt replied to Dennis McCarthy's discussion Would you like a lighting audit with your energy audit ?
Jan 18, 2013
George J. Nesbitt replied to George Kopf's discussion ASHRAE 62.2.2010 and the $20 app
"I thought somewhere I saw mention that the 62.2 2010 standard was available for free from ASHRAE, but don't seem to be able to find it. I can find some supplements for free, but they are incomplete. Can anyone point me to a free or cheap…"
Jan 18, 2013
George J. Nesbitt replied to Jack Baikoff's discussion Measuring fresh air intake ducted to a return and no way of measuring from outside.
"I've use my energy conservatory exhaust flow pan (on the intake grill), flow hoods can work too."
Jan 18, 2013
George J. Nesbitt replied to George Kopf's discussion ASHRAE 62.2.2010 and the $20 app
"George, I'll sell you my ASHRAE 62.2 2010 excel spreadsheet for $20! I think 62.2 is fairly easy. What we have to remember that it's a minimum standard, based on an assumed "natural ventilation" (leakage rate) of 0.15 achnat. I…"
Jan 18, 2013
Paul Morin replied to George J. Nesbitt's discussion Duct Testing High Velocity Systems
"if the duct leakage is relatively low, 200 cfm or less, the pressure in the duct system will be quite uniform and either location will give consistent results.  If the duct leakage is high, over 500 cfm, we recommend that you do two…"
Jan 10, 2013
George J. Nesbitt replied to George Whiting's discussion Retrofit insulation on the roof over cathedral ceiling
"Insulating above the roof deck is the way to go in this case. I am completing a simular project on my house currently. Remove the shingles, drill & fill the existing cavities with dense pack cellulose (3.5# cuft) or fiberglass. Air seal the…"
Jan 9, 2013
George J. Nesbitt's discussion was featured

Duct Testing High Velocity Systems

Dose anyone have experience testing high velocity duct systems?I've been asked to duct test a Zhender HRV with comfoducts (2" homerun ducts).I designed & installed a hydronic high velocity system a few years ago. It had 25' of 12" return flex duct, and 15-20' of 6+8" sheet metal ducting, 2 + 2-1/2" branch ducting. I sealed everything with mastic.I installed the duct tester at the return, and the duct pressure at the nearest supply to the air hander, as I would on a low velocity system. I…See More
Jan 4, 2013

Profile Information

Company
Environmental Design / Build
Professional Certification
MADD Building Scientist
Website URL
http://houseisasystem.com

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At 6:02am on December 16, 2012, Diane Chojnowski said…

Hi George,

Welcome to Home Energy Pros! Feel free to join the conversation in the Forum and Groups. And share your energy efficiency photos, videos and upcoming events. If you're blogging about home performance, this is the place for you!

Don't forget to upload your profile photo. And add your location on our Member Map!


Thanks!
Diane, HEP Moderator

 
 
 

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